A small group of Rep. Brandon Gill's fellow House Freedom Caucus members are privately questioning whether he still belongs in the hardline group, Axios has learned.

Why it matters: The 32-year-old Texas freshman's rapid rise through House Republican ranks has transformed him into one of the party's most prominent young stars — and earned him a growing list of critics.

Driving the news: Multiple House Republicans told Axios that Gill is the future of their party, but several Freedom Caucus members told Axios that his engagement with the group has faded as his national profile has grown.

The lawmakers spoke on condition of anonymity to offer candid assessments of a colleague.

"He's not really in the Freedom Caucus.…